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Conjunctivitis in cats is inflammation of the conjunctiva—the tissue lining the inner eyelids, covering the eye’s outer surface and extending over the third eyelid. A red, swollen, watery or sticky eye can be conjunctivitis, but the same appearance can accompany a corneal ulcer, glaucoma, uveitis, a foreign body or another painful disorder. Because appearance alone cannot identify the cause, a cat with redness, discharge, squinting or a closed eye should be assessed promptly by a veterinarian rather than treated with leftover drops.
This guide explains the signs owners may notice, the infectious and noninfectious causes veterinarians consider, what an examination may involve, how treatment is selected, and what to do while arranging care.
What is conjunctivitis in cats?
Conjunctivitis is inflammation of the conjunctiva, a thin membrane that lines the inner eyelids and covers the visible outer surface of the eyeball. Cats also have conjunctiva over the third eyelid (the pale membrane that can sweep across the eye’s inner corner). Inflammation can affect one eye or both.
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“Pink eye” is a useful everyday description, not a diagnosis. Infection is common, particularly in young cats and group settings, but irritation, injury, eyelid abnormalities and deeper eye disease can produce similar signs. A veterinarian must determine whether conjunctivitis is the primary problem or a symptom of something more serious.
Cornell’s feline health guidance notes that the condition occurs primarily in young animals and is prevalent in catteries and other multi-cat environments. That context helps a veterinarian assess risk; it does not prove an infection in an individual cat.
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Why is my cat’s eye red and watery?
Redness and tearing commonly reflect conjunctival inflammation, but the trigger may be infectious or noninfectious. Typical signs include:
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- Swelling of the eyelids or conjunctiva
- Watery tears or thicker discharge that may be yellow, green or otherwise colored
- Squinting, frequent blinking or holding the eye partly or completely closed
- Rubbing the face or showing light sensitivity
- A visible or swollen third eyelid
- Signs in one eye, both eyes, or one eye followed by the other
Discharge color does not reliably identify the cause. Viral disease can produce discharge, and a bacterial infection may occur secondarily; a colored discharge is not a reason to choose an antibiotic without an examination. Severe pain, marked cloudiness, a change in pupil size, bulging, trauma or sudden vision difficulty raises concern for problems beyond uncomplicated conjunctivitis.
Can cats get pink eye from an infection?
Yes. Feline herpesvirus, feline calicivirus, Chlamydophila felis and Mycoplasma are among the infectious causes veterinarians consider. A viral infection may damage the eye’s defenses and be followed by secondary bacterial infection, so more than one process can be present.
Herpesvirus is especially important because an infected cat can remain a carrier and have intermittent recurrences. Stress or another illness may precede a new episode. Severe or poorly responsive herpesvirus disease may prompt a veterinarian to consider antiviral treatment, but the drug, route and duration depend on the cat’s findings.
Merck’s information on chlamydial conjunctivitis describes a specific infectious syndrome that may spread among cats. Tell the veterinarian about new cats, shelters, catteries, boarding, respiratory signs and any affected housemates, since this history can influence testing and infection-control advice.
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What noninfectious problems can look like conjunctivitis?
Dust, smoke, aerosols, cleaning chemicals and other irritants can inflame the conjunctiva. Allergens, plant material or another foreign body may lodge under an eyelid or around the third eyelid. An eyelid that rolls inward (entropion) can make hairs scrape the eye continuously.
Conjunctivitis-like signs may also accompany a corneal scratch or ulcer, inadequate tear production (dry eye), glaucoma, uveitis, a tear-sac or tear-duct problem, a tumor or another disorder inside or around the eye. These conditions can threaten vision and may need completely different treatment.
One-sided disease does not rule infection in or out. As the Merck Veterinary Manual explains, inflammation limited to one eye can result from a foreign body, tear-sac inflammation or dry eye; an infection can also begin on one side and later spread.
Does my cat need a vet for eye discharge?
Arrange veterinary advice promptly for redness, abnormal discharge, squinting or a closed eye. VCA recommends immediate examination for these signs because an apparently minor case can conceal a painful corneal injury or another urgent eye disease.
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While arranging care, prevent rubbing if possible and keep the cat indoors. You may gently wipe discharge from the surrounding fur with clean, damp gauze, using a fresh piece for each eye. Do not pry open a painful eye, remove a visible object with tweezers, or put human eye drops, steroid drops, contact-lens solution or another animal’s medication into the eye.
How does a veterinarian diagnose the cause?
The veterinarian starts with a history and an examination of the eye, eyelids, third eyelid and surrounding tissues. They will ask when signs began, whether one or both eyes are affected, whether there is sneezing or nasal discharge, possible exposure to irritants, trauma, previous episodes and which cats or animals share the home.
Depending on the findings, tests may include:
- Fluorescein staining: a dye that reveals a corneal scratch or ulcer.
- Tear measurement: testing tear production when dry eye is suspected.
- Eye-pressure measurement: helping assess glaucoma or other pressure-related disease.
- Conjunctival sampling, scraping or biopsy: considered when an infectious, immune-mediated or unusual cause needs clarification.
- Tear-duct evaluation: used when drainage problems are suspected.
- Blood tests or other tests: selected when systemic illness or a more complicated presentation is possible.
Not every cat needs every test. The veterinarian chooses based on severity, examination findings, recurrence and response to initial care. A normal-looking cornea on casual inspection does not replace appropriate staining and examination when pain is present.
How is feline conjunctivitis treated?
Treatment is directed at the suspected cause and is adjusted if the eye fails to improve. It is not a menu of interchangeable over-the-counter products.
| Situation the veterinarian suspects | Possible management | Why follow-up matters |
|---|---|---|
| Suspected bacterial infection or secondary bacterial infection | Prescription topical or, in selected cases, oral medication | The drug must fit the examination findings, and a corneal ulcer must not be missed |
| Herpesvirus, especially severe or poorly responsive disease | Veterinarian-directed antiviral treatment may be considered | Carriers can have recurrences; persistent signs may indicate another or additional problem |
| Irritant or foreign material | Removal or management of the exposure, with eye care chosen after examination | Continued exposure or a retained foreign body prevents healing |
| Entropion or another eyelid defect | Correction of the eyelid problem and treatment of resulting irritation or injury | Medication alone may not fix repeated mechanical rubbing |
| Corneal, pressure-related or intraocular disease | Condition-specific urgent treatment and monitoring | These disorders can threaten vision and are not safely managed as simple conjunctivitis |
Antibiotics do not treat viruses, and a steroid can be dangerous when a corneal ulcer or certain infections are present. Never restart a previous prescription without veterinary approval: VCA warns that medication that helped during an earlier episode may not help now or could be harmful.
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VCA reports that many nonspecific bacterial or viral infections resolve in roughly 5–14 days, but that figure is context from its guidance, not a safe waiting period for every cat. Cornell describes a commonly prescribed schedule of three or four applications daily for two to three weeks in some cases; that attributed schedule is not an owner’s treatment plan. Use the exact product, dose, frequency and duration your veterinarian prescribes, and complete follow-up even if the eye looks better.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How can I give eye medication safely?
Ask the clinic to demonstrate the technique and clarify whether drops or ointment should be given first when both are prescribed. In general:
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- Wash your hands and check the label, expiration date and dosing instructions.
- Have the medication, a towel and a reward ready before restraining the cat.
- Position the cat securely, using a helper or a loose towel wrap if needed. Avoid pressing on the eyeball.
- With one hand, gently lift the upper lid or lower the lower lid; keep the bottle or tube tip from touching the eye, lashes or skin.
- Place only the prescribed amount, close the lids gently if instructed, and reward the cat.
- Wash your hands again. Use separate cotton or gauze for each eye and follow the clinic’s instructions about cleaning discharge.
Call the veterinarian if the cat cannot be medicated safely, the eye worsens, the cat becomes more painful, or there is no improvement in the timeframe the clinic gave you. Do not double a missed dose unless the veterinary team tells you to.
Can conjunctivitis spread to other cats?
Some infectious causes can spread through close contact and contaminated hands, bedding or bowls. Until the cause is clearer, wash your hands after handling the affected cat, clean shared items, avoid touching one cat’s eye and then another’s, and ask the veterinarian whether temporary separation is appropriate. Respiratory signs, multiple affected cats or a recent introduction should be reported promptly.
Good hygiene reduces transmission but does not replace diagnosis. Vaccination can reduce the impact of some respiratory pathogens, yet vaccinated cats may still develop eye disease from causes not covered by a vaccine.
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Can conjunctivitis come back?
Yes, particularly with feline herpesvirus, because infected cats may remain carriers and experience intermittent episodes. Recurrence can also reflect ongoing irritation, an eyelid abnormality, dry eye, an incompletely resolved infection or a different eye disorder.
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Record which eye is affected, the date signs start, discharge changes, appetite, respiratory signs, possible stressors and every medication given. That history helps the veterinarian distinguish recurrence from treatment failure and decide whether additional testing is warranted. Repeatedly using old drops can obscure the picture and expose the eye to an inappropriate drug.
What should owners remember?
Redness, discharge and squinting are reasons to contact a veterinarian, not clues that identify a single home treatment. Conjunctivitis may be uncomplicated, but the same signs occur with ulcers, glaucoma, uveitis, foreign bodies and eyelid disease. Prompt examination protects vision, allows cause-specific treatment and is especially important when pain, cloudiness, trauma, recurrence or poor response is present.
Frequently Asked Questions
Is feline conjunctivitis contagious to people?
The risk to people depends on the underlying organism rather than the appearance of the eye. Ask your veterinarian about the specific diagnosis, wash hands after handling the cat or eye medication, and use extra caution around people with weakened immune systems.
How long can a cat with conjunctivitis stay home before seeing a vet?
There is no universal safe waiting period. Although some uncomplicated infections reported by VCA resolve in 5–14 days, a painful ulcer or glaucoma can worsen quickly, so redness, discharge, squinting or a closed eye warrants prompt veterinary advice.
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Should I clean my cat’s eye with saline?
Do not assume a household saline or contact-lens product is appropriate. Ask the veterinary clinic what, if anything, to use for wiping discharge; never use a solution containing disinfectants or preservatives not intended for the eye.
Can lysine cure herpesvirus conjunctivitis?
Evidence is mixed, and the reviewed veterinary guidance does not establish lysine as a reliable treatment. Discuss any supplement with your veterinarian instead of substituting it for examination or prescribed antiviral and supportive care.
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